Internal overflow multi-stage fluidized bed reactor

Abstract

The invention provides an internal overflow multi-stage fluidized bed reactor, comprising a fluidized bed reactor body, perforated plates, an overflow pipe, a particle input mechanism and a fluid distributor, wherein the perforated plates are distributed at different bed layer heights in the fluidized bed reactor body; each of the perforated plates are used to divide the interior of the fluidizedbed reactor body into two adjacent stages of bed layers, at least two overflow pipes with different overflow heights are arranged between every two adjacent stages of bed layers; each of the overflowpipes is used to transport catalyst particles in the upper stage of bed layer of every two adjacent stages of bed layers to the corresponding lower stage of bed layer; the particle input mechanism isarranged on the side wall of the fluidized bed reactor body corresponding to the uppermost stage of bed layer; the fluid distributor is arranged at the bottom of the fluidized bed reactor body for distributing fluid entering through the fluid inlet of the fluidized bed reactor body. The solution provided by the invention effectively reduces back mixing by multiple stages of bed layers in series.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an internal overflow multi-stage fluidized bed reactor. Background technique [0002] Fluidized bed reactor is a common form of catalytic reactor, especially suitable for situations with high heat transfer load and frequent catalyst regeneration, such as catalytic cracking (FCC) and methanol to light olefins (MTO). In the single-stage fluidized bed reactor, the fluidized catalyst particles are in a highly back-mixed state, which is not conducive to keeping the catalyst with low carbon content in the reactor and sending the catalyst with high carbon content to be burned for regeneration. At the same time, because the catalyst particles adsorb or entrain gaseous or liquid substances, the back-mixing of gaseous or liquid substances will also be intensified during the fluidization movement of the catalyst particles in the fluidized bed reactor, which is beneficial to the im...

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Problems solved by technology

At the same time, because the catalyst particles adsorb or entrain gaseous or liquid substances, the back-mixing of gaseous or liquid substances will also be intensified during the fluidization movement of the catalyst particles in the fluidized bed reactor, which is beneficial to the improvement of raw material conversion rate and product selectivity. unfavorable

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